如何在 MATLAB 中更新/动画复杂图形？

debugcn 发表于 Dev

D.拉洛克

我需要为一个复杂的图形制作动画，该图形由一系列矩形组成，形成一个手臂。下面是这个手臂在没有动画时的样子的例子：

为了动画这个数字，我做了以下代码：

function renderFrame(fig, data)
    hold(ax, 'on'); % Need to hold so that new elements of the arm add themselves
    showMembers(fig, data); % Create patches and rotate them to the right angle to create members
    showJoints(fig, data); % Draw circles at the joints betwwen the members. Use the width of rectangle members  
    drawnow;
    hold(ax, 'off'); % Next rendering will replace this one; No need to hold
end

function rotateMember(fig, data, iMember, rotAngle)
    for iAngle = 1:rotAngle
        updateMemberAngle(data, i, 1); % Change thew data so the i-th member rotates by 1
        renderFrame(fig); % Show frame after the data was changed
    end
end

function main()
    fig = figure;
    ax = gca;
    axis(ax, 'equal');
    setAxis(data); % Set axis limits and create axis arrows with totalLength of the arm
    renderFrame(ax, data);
    rotateMember(fig, data, 3, 90); % Rotate 3rd member by 90 degrees
end

main()

但是我的动画帧根本不清晰。结果是这个图：

我究竟做错了什么？有没有办法通过清除框架来绘制具有多个部分的复杂图形并为其设置动画？

我研究过使用newplotand nextplot，但MATLAB 关于该主题的文档一如既往地不完整。我还尝试创建图形对象，然后在每次迭代时设置数据，但每次删除图形时它都会拒绝异常，因为“图形对象已删除”。

D.拉洛克

找到了一种清除轴子项的方法，除了两个轴箭袋（箭头）。

这是一个正常工作的代码：

function renderFrame(renderAxes, data)

    % CHECK IF THERE ARE MORE GRAPHIC OBJECTS THAN ONLY THE QUIVERS
    if ~(length(renderAxes.Children) == 2)

        % DELETE EVERYTHING EXCEPT THE AXIS QUIVERS THAT WERE RENDERED AT THE BEGINNING
        % MATLAB ADDS NEW GRAPHIC OBJECTS TO THE BEGINNING OF AX.CHILDREN
        delete(renderAxes.Children(1:length(renderAxes.Children)-2))
    end

    showMembers(renderAxes, data); % Create patches and rotate them to the right angle to create members
    showJoints(renderAxes, data); % Draw circles at the joints betwwen the members. Use the width of rectangle members  
    drawnow;
end

function rotateMember(ax, data, iMember, rotAngle)
    for iAngle = 1:rotAngle
        updateMemberAngle(data, i, 1); % Change thew data so the i-th member rotates by 1
        renderFrame(ax, data); % Show frame after the data was changed
    end
end

function main()
    fig = figure;
    ax = gca;
    axis(ax, 'equal');

    % HOLD AXES AT THE BEGINNING OF THE SCRIPT
    hold(ax, 'on');

    setAxis(data); % Set axis limits and create axis arrows with totalLength of the arm
    renderFrame(ax, data);
    rotateMember(ax, data, 3, 90); % Rotate 3rd member by 90 degrees
end

main()

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